Alvin barton



ALVIN BARTON, OF SYRAGUSE, NEW

YORK, ASSIGNOR TO HIMSELF, A. R. MORGAN, AND J. M. PARSONS.

DOOR-SPRING.

Specication of Letters Patent No. 14:,583, dated April i, 1856.

To all whom t may concern:

Be it known that I, ALVIN BARTON, of the city of Syracuse, in the county of Onondaga and State of New York, have invented a new and useful Improvement in Door- Springs; and I do hereby declare the following to be a full, clear, and exactdescription ofv the construction and operation of the same, reference being had to the annexed drawings, making part of this speciication.

The nature of my invention consists in the method hereinafter described of regulat-ing the action of coiled springs used in closing doors and gates-viz, by the employment of eccentric gearing, in connection with a changeable po-int of action on the door or gate.

To construct my invention make the case (A) of cast iron say two and half inches wide, and four inches in length, and three fourths of an inch in depth. Make the inner plate (B) one eighth of an inch in thickness, and its length and width corresponding with the open side of the case (A), and fit in flush with the upper edge Make screw holes through the corners of both the case (A) and plate (B) for the passage of screws in fastening the whole to the casing of the door. The box or case (A) contains the coiled spring (D) and the two eccentric gear wheels (E) and The wheel has a hole (G) near one side for the passage of the bolt (O) upon which it works. On one side of this wheel is a projection (H), nearly surrounding the bolt, having an opening (I) into which the curved and inner end of the coiled spring (D) is attached. The wheel (F) has a projection (M) on one surface and near the side, which fits into the opening or hole (K) in the plate On its other surface is another projection (J) opposite (M) which passes through the case and attaches to the larger end of the lever (L). The two wheels work together by gearing closely fitted. The notched wheel (N) is placed upon the outside of the case (A) .and works upon the same bolt (O) that passes through the spring and wheel A dog (P) is attached to the outer surface of the case so that its movable end acts in the notches in the wheel (N). Near the side of the notched wheel (N) is a pin (R) which projects through the curved slot (S) in the case. The long lever (L) has one end attached to the shaft of the wheel (F),

and its other or movable end attached to a pulley wheel i The gear wheels having their shafts out of their center require to be made oval in order that cogs may work together. The action of the cog wheels is such, that when t-he wheel (E) which is acted on by the spring, is exerting its greatest power by the cogs nearest the shaft, it is acting upon the cogs of the other wheel at a point most distant from its shafts, and the lever (L) being attached to the shaft 0f the wheel (F) so that when the door is wide open the wheels will stand in the position represented in the drawing (Figure l), that is, so that the spring will exert but little power upon the door; but as the door closes the relative position of the wheels changes, and the spring exerts a greater power by a change of leverage in the wheels.

(V) is a round rod having each of its curved ends attached to the upper part of the door, and standing out in distance equal to the diameter of the pulley wheel It is obvious that as the door opens the pulley runs on the rod toward the hinge-side of the doo-r and consequently its power is lessening as the door is opened ,-and again as the door closes. The force exerted. through the lever has an increased effect on the door, and this increase continues until the door is closed. This effect is attributable in part to the eccentricity of the gearing, and part to the changeable point of action of the lever on the rod (T).

The inner end of the spring is attached to the wheel near its center of action,-- and the outer end is attached to the pin on the notched wheel (N), which pin moves through the curve of thev slot S as the wheel (N) revolves. The object of which is to tighten up the spring as more power is desired, Aand it is then held in its place by theY dog (P).

The whole apparatus is to be applied to the door as shown in drawing No. 2.

What I claim as my invention and desire to secure by Letters Patent, is,

The employment of eccentric cogwheels (E and F) as described, in combination with the coiled spring, lever, and guide rod attached to the door or gate, the whole operating substantially as set forth.

, ALVIN BARTON.

Witnesses:

R. F. STEVENS, A. R. MORGAN. 

